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INVERTEBRATES

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by

Rosa Sanchez

on 2 December 2014

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Transcript of INVERTEBRATES

PORIFERA
CNIDARIANS
POLYPS
CLASSIFICATION OF INVERTEBRATES
MOLLUSCS
INVERTEBRATES
They have a large opening called osculum and many small pores. Their collar cells (choanocytes) obtain nutrients and oxygen from water.
SPONGES
WORMS
PLATYHELMINTHES

TAPEWORM

FLATWORM
They are parasites that live in the intestines of some animals
An example is the TAENIA
They can live in streams, ponds or lakes
NEMATODES

INTESTINAL WORM
They are parasites and live in the intestine of animals
ANNELIDS
EARTHWORM
LEECH
They are not parasites. They live in wet soils. They are hermaphrodites
They live in freshwater environments and feed on blood of other animals. They are hermaphrodites
They are cylindrical and smooth
They are flat
They are cylindrical and their body is divided into segments called metameres. They have cutaneous respiration
They have a sac-like body and are attached to the sea floor. They have asexual reproduction by fragmentation
MEDUSAE
They are umbrella-shaped and gelatinous. They can move by contracting their body. They reproduce sexually
They are also called jellyfish
BIVALVES
They have shells with two valves
razor shell
oyster
clam
mussels
GASTROPODS
They have a separate head and body and four tentacles
They have tentacles around their single opening which is the mouth and also the anus. They have cells called cnidocytes to hunt their prey
snail
slug
scallop
CEPHALOPODS
They have tentacles with suction cups
squid
octopus
ARTHROPODS
They have jointed limbs (legs and antennae) and an external skeleton called exoskeleton
MYRIAPODS
Their head has one pair of antennae and their body has many pairs of legs
millipede
centipede
ARACHNIDS
Its body is divided into two parts: CEPHALOTHORAX (with four pairs of legs) and ABDOMEN

SPIDER
TICK
SCORPION
CRUSTACEAN
Their cephalothorax has two pair of antennae and usually five pairs of legs. They also have an abdomen.
LOBSTER
CRAB
PRAWN
INSECTS
They have HEAD (with one pair of antennae), THORAX (with three pairs of legs and usually two wings) and ABDOMEN
BUTTERFLY
FLY
BEETLE
BEE
GRASSHOPPER
CRICKET
COCKROACH
ANT
ECHINODERMS
They have a system of ambulacral tubes through which seawater circulates
ECHINOIDS
SEA URCHINS
ASTEROIDS
STARFISHES

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